Stoneworking-machine.



G.` H. GILMAN.

STONEWORKiNG MACHINE.

APPLICATloN FILED FEB. 20. 190s.

Patented June 5, 1917.

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G. H. GIUVIAN.

STONEWORKING4 MACHINE. APPLICATION FILED FEB. 20. 1908.

G. H. GILIVIAN.

STONEWOHKING MACHNE,

APPLICATION mw FEB. 2o. 190s.

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6 SHEETS-SHEET 3.

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APPLICATION man FEB. 2o. 190B.

Patented June 5, 1917.

G. H. GILNAN.

STONEWOBKING MACHINE.

APPLICATIQN FILED FEB. 20. 1908.

Patented June 5, 1917.

6 SHEETS-SHEET 5.

G. H. GILMAN. STONEWORKING-MACHINE.

APPLICATION FILED FEB- 20. 1908.

Patented June 5, 1917.

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GEORGE H. GILMAN, OF OLAREMONT, NEVI HAMPSHIRE, ASSIGNOR, BY MESNE ASSIGN- MENTS, T0 SULLIVAN MACHINERY COMPANY, 0F BOSTON, MASSACHUSETTS, A COR- PORATION OF MIASSACHUSETTS..

sroNnWoRniNe-ivmcnmn. l

l Specification of Letters latent.

Tateiited June 5, 1917.

.To @ZZ whom 'it may concern:

Be it known that I, GEORGE H. GIIMAN, a citizen of the UnitedStates, residing at Claremont, in the county of Sullivan', State ot New lilampshire7 have invented an 1m protein/ent in Stoneworking-Machines, of which the following description, in connection with the accompanying dra-wings, is a specification, like letters on the drawings representing like parts.

This invention relates to stone working machines, the particular embodiment thereot; which is here illustrated, being a machine intended particularly for the dressing or surfacing ott stone.

rlhe invention will he best understood by reference to the following description when taken in connection with the accompanying illustration of one specific embodimentl Figure l is a side elevation of a surfacing machine embodying one form of my invention;

Fig. 2 is a longitudinal section in elevation, on an enlarged scale, showing the tool holder carriage;

Fig. 8 is a plan View of the tool holder carriage;

Fig. Llis a sectional elevation taken through the cap or crown piece at the top of the standard and at right angles to the View shown in Fig. 1;

Fig. 5 is a similar section taken in a plane transverse to that of Fig. 4;

Fig. G .is a side elevation of a modified form o1E main supporting carriage on a. somewhat enlarged scale;

Fig. 7 is a section on the line 7-7 in F t3;

Fig. 8 is aplan View of the main support-` ingA carriage shown in Fig. 1;

Fig. 9 is a side elevation of the same,

FiglO is a transverse sectional elevation taken through the rope-winding drum at one end of the supporting arm,

Fig. 11 is a central7 sectional. elevation taken through the working cylinders and controlling Valve of a duplex hammer tool emhodyin@ one for-m of my invention;

-S .section taken. in a plane at right-angles to the View shown in Fig. 11;

Fig. 13 is a detail showing the regulating Valve in a position ditlierent from that in Fig. 11; l l

Fig. 141 is a plan in section taken on the line 14e-14 in Fig. 11; 1

Fig. 15 is a section in plan talrenthrough the working cylinders on' the line 155-15 in Figs. 11 and 12;

Fig. ,16 is a central elevation taken through the valve and Valve block on the line 16-16 in Figs. 11 and 1-1; y

y Fig. 17 is a detail-showing the regulating valve with a portion of the valve stem attached; Y

Fig. 18 is a section on the line 18-18 in Fig. 17 i f Fig. 19 is a section on the line 1919 in Fig. 17

F 'g. 20 is a section on the line 20--20 in Fig. 21 is a general diagrammatic View 4showing a development of the pressure passages relatively to the controllingand regulating vvalves F ig. '22 4shows the rcontrolling Valve in a reverse position from-that shown in 'Fig'. 21;

Fig. Q3 shows the regulating Valve in another position and corresponding to the position shown in Fig. 13; and

Fig. 2st is a partial side elevation of the duplexv tool in Fig. 11 showing the regulatyalve handle. Y

Referring to the drawings land particularly to Fig. 1,v the machine is mounted upon the same sustains and guides a main supv porting carriage 5 which may he raised or lowered upon the standard at the Will ot the operator by devices to he described. Fhe carriage supports the laterally extending supporting arm, hel-'ein in the form of a n tivelyto the supporting standard, while, at n the samey time, ythe tool may be swung about the support in the arc of a circle, as require ments of the work may demand:

kIn addition to the adjustment of the effective lcngth'of the radial arm the tool carriage itself' is' adapted to move along the ysaine,',thereby to permit the operator to yquickly shift, or adjust the positionof the toolfoi slight differences in the position of the latter over the desired radial distance from the central support. y

rfilthough the. swinging adjustment of the tool about the central support maybe b-y tained in other ways, in the present construction the main supporting` carriage is mounted sothat it can both turnabout and move vertically up and down the column 4l. Referringfto vFigs. 1, 8 and 9, the carriage 5 is providedlwith separate sleeve portions 9 which may embrace the tubular support l with Ysufficient clearance, so that the carriage may turn freely about the same or move Afreely up and dowrnbut sufficiently close to inaintain'the arm 6 substantially firm and.

rigid. The radial supporting arm 6 herein kconsists of a frame-work composed of sepa-r rated supporting members l() and 1l (Fig. 8), each comprising` a channel irony extending lengthwise the arm, and transverse dis`- tanceV or separating members-12 and 13 at oppcsiteends'of the armpthe whole constitutinga rectangular frame which incloses or embraces the supporting column. Each channely iron is preferably filled with wood 14 or other suitable material so as to deaden and yreduce thek vibration consequenton the employment of the tool 8. Each channel iron of the supporting arm is confined loetweeny pairs of upper and lower rollers l5 journaled upon the carriage 5, the distance Vbetween the rollers being such that while the arm'is fiXe/dly and rigidly held in the ydesired horizontal position upon the car#` riage it may befslid longitudinally or ra-` diallywith reference to the supporting col` umn, at will upon the rollery bearing supyports thus afforded. n

f lf it is desiredl to rsecure the radial arm in i' fixedrposition 'relatively to the carriage 5, f @means are herein provided whereby the two maybe clamped together. For this purp osey theL carriage (Figs` '8 and 9) `is provided with a roclr shaft 37 journaled trans- -'veisely in the" carriage and provided at each outer endwithl eccentric cam sleeves 38 keyed thereto. Such shaft is provided with the depending` arin 3i) which, whenturned to the full line position represented in F ig. 9,-, `wedges or pinches against the channel irons andis effective in clamping or locking the supporting arm to the carriage.y lhen the cams and the arm are turned to the position represented in dotted line, however, the bindingeiiect ofthe cams is relieved and the supporting arm is frce'to be adjusted in or out. f f l rllhe particular yfconstruction of yclamping means for holding the arm is not essential.' in Figs. Gand? l have shown a modified construction of supporting carriage. Herein the carriage is provided with the T-sliaped shoe or clamping'member 1G which overlics the upperr flange of each' channel iron. "The y clamp he a depending' leg 17 'provided with y an exposed transverse slot adapted to rekceive thetapered key 18 so that if the latter is forced into the slot against the adjacenty portion oit the carriage frame they clamp will y' n be drawn down against `the channel irons and the latter held fixed between the clamp and thclower set of rollers l5. 'A spring l5) is preferably employed to lift'tlie clamp when out ci use so as to free it from the channel irons. f n

ln the use of a surfacing machine itis frequently desirable for the operator to ad-y just the height of'thesupportingarni andrk the tool without leavinghis yposition adjacent the tool., r,Provision is here made for ringe 5 by means which yare located at or' adjacent the effective end of the supporting f arm 6, so that the operator, while adjacent the tool and the work and without leaving the saine, can raise orlower the.. armk to the precise position desired. n f

lilrlhile other means may be employed for this purpose in the illustrated form of the raising or lowering the main supporting car-r J invention5 the supporting carriage 5 is both sustained and adjusted by means of ya` rope or cable 20. One end of the cable is fiXedly secured to the distance niemberl rat the end oi the supporting arm. it thence'passes to and about a guidingsheavel upon the rsupporting carriage, thence up and overa pair of guiding sheaves 22 at the top, of the columny (see Fig. thencek down about the second supporting 'sheave 28 upon the'supr porting carriage, thence to the opposite end of' the arm about theiguiding shcave 2e' and down and about a rope-winding drum Q5, at

which point it may be taken up or let out to raise or lowerthe carriage.

lVith the lifting rope Q0 attached in this rmanner the supporting arm may be ymoved in and out longitudinally between the rollers' 15 upon the carriage without in any way affecting the vertical adjustment of the lat-y ter, for the rope will run freely over 'the guiding sheaves 2l and Qwithout changing the height of the arm. Likewise the carriage may be raised or lowered without in any wise affecting the longitudinal adjustment of the supporting arm 6.

At the top of the column the guiding sheaves are journaled upon a crown piece 26, the latter revolubly mounted upon ball bearings carried by the plug or stud Q7 threaded into the top of the column. The crown piece 26 is therefore perfectly free to turn and adjust itself to any position about the axis of the column in response to the swinging adjustment of the radial supporting arnn and such swinging adjustment may be effected by the operator by merely pulling the tool toward him or pushing the same away from him. The crown piece 26 is preferably provided with an cyo 28 pivotally se- `cured to the top of the same7 so that the entire machine may be lifted about from one point to another' by suitable hoisting mecha nism. rit the side of the crown piece and at ri ght angles to the rollers 2:2 is provided the sheave 29 journaled upon a stud secured to the crown piece, which, sheave is deeply grooved so as to be capable of guiding and receiving the hose 30 used to convey the pressure fluid to the workiifig tool. The crown piece 26 is prevented from lifting away from the plug 27 by the nut 26X When the machine is hoisted for conveyance from place to place by the eye 28, as above described.

rlhe Winding drum 25 is mounted to turn in journals formed in bracketsfl secured at the end and either side of the radial arm, the guiding sli-cave being also journaled to upper portions of said brackets. The winding drum 25 (Fig. l0) has threaded into the end thereof the stud `32 to which is attached the ratchet 33 and the squared projecting portion 34, the latter adapted to receive a suitable crank and handle, so that the drum can be turned therethrough and the rope Wound on or unwound from the drum. The ratchet is engaged by the pivoted pavvl B5 preventing backward movement of the drinn, the paivl having a. Weighted tail piece 86 by which the operator can Withdraw it from the teeth of the ratchet when desired.

lt is frequently desirable not only to adjust the height vertically of the supporting carriage from a position at or near the tool, but also to adjust the longitudinal relation of the radial arm Within the supporting carriage also from the tool supporting end of the arm. To the form of clamp represented in Figs. l, 8 and t), l have shoivn applied connections whereby the arm may be adjusted in and out from its support and clamped in such position or unclamped for further adjustment, all under control of devices extending to the end of the arm. For this purpose the depending arm 39 is attached to the endless cable or rope 40, which latter passes over a. guiding sheave 41 at the rear and over a second and preferably double guiding sheave 42 at 'the forward end of the frame. The sheave 42 is lsecured to a rotatable stud 4 3 journaled in the Winding drum Q5, but freely rotatable independently thereof. To the stud 43 is also keyed a ratchet Wheel 44 adapted to be engaged by the Weighted paivl 45 and thereby held in any assigned position. The stud is also preferably provided with means such as a. hand lever 46 by which it may be turned and the sheave 49. thereby turned to move the rope and turn the arm o9 and attached cams in one direction or the other. lt is only necessary, therefore, for the operator While standing at the end of the arm and adjacent the tool to turn the hand lever 46 to unelamp the arm, whereupon it can be freely adjusted. After adjustment the hand lever can be again turned and locked by the pawl to clamp the arm in fixed position. These clamping and unclamping devices also can he controlled by the operator at any position along the radial supporting` arm through manipl:lation et' the endless cable 40.

In addition to the longitudinal movement of the arm 6 Within the carriage 5 the toolsupporting carriage itself may be adjusted longitudinall),T upon the arm, thus affording a delicate adjustment of which the operator can readily avail himself as occasion demands in the course of his Work. For this object the carriage 7 is provided With sets of upper and lower rollers 47 adapted to track with the flanges of the angle irons 10 and 1l, suilicient clearance being provided to permit it to readily move longitudinally. To enable the operator to accomplish this readily there is provided at either side of the carriage the handle 48. The carriage is provided with a central supporting or sustaining sleeve member 49, Within which is revolubly mounted the neck or stem 50 of the tool 8, there being` provided suitable and preferably ball bearings 51, whereby the tool may be readily turned as a Whole Within the sleeve 49. The neck is provided with a central passage leading to the valve chamber or chambers of the tool S and is supplied with pressure fluid from the hose 30 which is connected centrally to the sleeve through the nipple 53, so that a reasonably free rotation or turning of the tool as a Whole may be performed without displacing or affecting in any Way the hose connection to the device.

To permit the operator to turn the entire tool at will and thereby enable him to govern the resultant alinement of the lines of cut produced by the cutting device or devices actuated by the tool, I have provided means, such as the handle 54, at either side of the tool, which the operator may grasp to turn the tool at will. The turning of the entire tool as a body Within its supporting .carriage and relatively to the arm and support ypermits the employment kof a gang of tools or a plurality or" cutting units which,

by this operation may be simultaneously turned fwhile thealinement of the cuts pro- /duced maybe kept uniform. -lln the illus-y trated form of my invention l have employed a duplex :torm'of pressure-fluid-actuated, piston-hammer tool yhaving two sets yof cutters or cutting units, each actuated by itsv own separatepiston hammer and adapted to be so Vcontrolled that they may be operated infopposed step (thereby to reduce the resultant vibration), or one 4individually to the'exolusion of the other. The admission ofluid pressure tothe tool is regulated by the` throttle valve 5,5 interposed in the line *i 'rlny desired valve construction may be employed for the purpose of securing a nonsynchronous operation of the two cutting' units, but for illustration l have herein illustrated aconstruction 'ot yvalve whichy not onlysecures anon-synclu-onous operation of the hammerpistons, but maintailis them in opposed step.

"flleiterring,now more.particularly to Figs.

llfto inclusive and especially to Fig. 1l, the body Soft the tool is provided with cylinder chambers 56 and 57,r within which re- `eiprocatethe pistons 58 and 59 respectively,

provided with reduced striking ends adapted to strike the separate cutting tools 60 and G1. which are loosely held in the bush` ings 62"and 63. rlhe tool body is provided at the rear end with the upper headrland at kthe forward end with the lower head 65.

yln the illustrated form of the invention a hditl'erential pressure-actuated yvalve G6 is movable withinthe valve block 67.

y rlhe'latter is formed by the ,upper part of the upper head Gd and,` in turn, is surmounted by the end piece 68 connected to the neck'50. The valve works within the suitably apertured valve bushing 69, the end of which is closed by thejthreaded cap 70, the latter having the plug.' 7l serving as a guide land support for the hollowy interior of the valve. The opposion of pressure fluid to the larger pressure receivingarea at the opposite yendfof the 60, i yone or thegother intermittent valve between the samey and the cap 70. This takes place under the control of one or the other of the 'two 'hammer pistons through pressurey ports f L74 andr'; (Figs. l2 andld) f Fei-inthe admissiony ot pressure to and its exhaust from' thel'iead end of the cylinders,

the cylinder 56 iS @lfm/Titled with' the passage 76 'leadingto the head end oifdthefcylinder and controlled by the valve 66, and ther cylinder 57 yis provided with a like passage 77.

` The passage f76leads into an annular groovey 7 8 (see Figs. 11 and 16)y in the valve bushing' 99, and 'thepassage 77 into ya similar groovey 79, and the valve is also provided"y withcoperating circumferential grooves 80 and Sl through which the said passages are adapted alternatively to be placed in communication with the pressure admission passage 52 as th'e valve is alternately moved from one position tothe other. f

yNext adjacent thegrooves 7 8 and 79 respectively, the' valve bushing ,isy also pro` vided with grooves'82y and Swhich, asr

shown in Fig. ll, connect directly and constantly with the interconnecting ,exhaustr ypassages 84, so that, withthe valve 1n the position shown' iny Fig( il, while, pressure fluid is being admitted y,to the head end of the cylinder 5G itis being siInultaneously` exhausted from the head end of ther cylinder 57 through the passage 77, valve groove Sl,

bushing groove S3 and exhaust passages S-l.

ln the reverse position of the valve, the head f endr of the rcylinder 56 is connected with the exhaust through thepa ssa ge 8O and bushing groove 82.

The admission of/pressure to andy exhaust from the opposite or tool end kof the eylin-k ders 56 and 57 respectively, yiscontrolled 76, valve ygroove y through the tool and pressure passages `S5 and S6 which, as yrepresentedin Figs. 12, leland l5, extend longitudinally in the walls of the tool 'body between the piston chambers, and enter their respective cylinders ioo through the ports y87 and SS at the lower i ends thereof. i y i i y,The toolend pressure passages Sfand 86 extend upwardly through the cylinder head and valve block (see Figs. 12, la and 16) where they have direct connection with the annulark grooves 78 and 79 respectively, by

one or more horizontal passages 89 and y90 (see Figs. 14 and 16), soy that, when the pasy sage 7 6 is opened tothe admissionpassage i lo 52 bythe valvep7 1the tool end pressure pasly y sage Sor thetool-end of theother cylinder is simultaneously opened to the admission,

and when the passage 76 is openedto the exhaust, pressure luid is simultaneously ex@ hausted from the toolend*of the oppositey cylinder. ln'other words, the pressure controlling passage for ythe tool-end of each:

cylinder is soassociated with the passage for the head end of the kother cylinder that re-y verse pressure conditions invariably prevail at the corresponding ends of thetwo cylinders duringthe operation of the instrument,

thereby insuring the movement yof thetwo hammer pistonsy yin,opposed step. y For periodicallyreversing the controlling valve, constant pressurey passages 91 and 92k c are provided for the cylinders' and 5T Ires'pectively opening into their cylinders through ports 93 and 94 respectively, the latter being located at about the same position lengthwise the cylinders as the tvo ports 95 and 96 which open from the intermittent pressure passages 7a and 75 into the cylinders 56 and 57 respectively.

The pistons 58 and 59 are provided with the respective grooved portions 97 and 98, so that the intermittent pressure port in each cylinder is placed in communication with its constant pressure port when its piston approaches the limit of its downward movement although, as will more fully appear, when the two cutting units are operating jointly, reversal of the controlling valve is effected by the intermittent pressure port ot' one cylinder alone, the intermittent pressure port for the remaining cylinder being cut oli' from the controlling valve, as will more fully appear, by the regulating valve 99, which may be employed' to throw out of operation one of the two cutting units, while continuing the operation ot the remaining UllG.

ln addition to the ports 95 and 96 the intermittent pressure passages are also pro-A vided with ports 100 and 101 opening intotheir respective cylinders below the Aports 95 and 96, these being employed to exhaust the pressure fluid from the intermittent pressure area of the valve.

The conditions under which the cutting units operate simultaneously will be best understood by reference to the diaphragm of passages shown in Fig. 1 where the passages and 92 are shown opened, and the passages 711 and 91 closed by the regulating valve 99. Pressure fluid is then admitted through the intermittent pressure port 96 to the larger diierential area of the valve near the end of the forward movement of the piston 59, thereby moving the valve from the position shown in Fig. 22 to that shown in Fig. 21. rThis, as above described, reverses the movement of the piston in each cylinder. 0n rearward movement of the piston 59 the port 101 in the intermittent pressure passage 75 is soon uncovered and, the forward end of the cylinder 57 being at that time open to the exhaust (as will be explained), the pressure fluid is exhausted from the differential area of the valve and the latter moves again to the position shown in Fig. 22 to reverse the movements of the twopistons.

To exhaust the forward ends oli' the cylinders ports are provided which are uncovered in each cylinder by its respective piston on rearward movement. The cylinder 56, is provided with a pair of exhaust ports 102, and the cylinder 57 with similar ports 103, the former connected to exhaust passages 1011, and the latter to exhaust passages 105, which passages extend lengthwise the cylinder and valve block outside of the control ot the regulating valve 99, and connect at their ends tln'oughgrooves 106 and 107 respectively (sec Fig. 11) with the exhaust passage 84.

rEhe complete operation of the tool will now be understood.` Under theconditions represented in Fig. 21, the piston 59 is at the forward end ot' its stroke, having delivered its blow again to its tool. The reduced piston portion 98 has already opened the intermittent pressure port 96 to the constantl pressure port 98 and caused the reversa of the valve. llfhis has opened the head end ot the cylinder 57 to the exhaust passage Sel through the passage 77, and has also opened the forward end of the cylinder 57 through the port 88, and the passage 86 to the admissic-n passage ln the cylinder 56 the head end passage 76 has been opened to the admission, while the 'tool end passage 85 through its port 87 has opened to the exhaust, the direction ot' transference of fluid pressure being represented by arrow hea-ds appearing in the said ligure. On the subsequent upward stroke of the piston 59, and he accompanying downward stroke of the piston 58, the exhaust port 103 is soon uncovered and followed by the uncovering of the intermittent pressure port 101, this serving to exhaust pressure fluid from the larger area of the valve and permit reversal of the same to the position shown in Fig. 22. Pressure liuid is then admitted to the head end of the cylinder 57, and the forward end of the cylinder 56, as represented by Fig. 22.

It it is desired to throw the piston 58 out of operation while still continuing the action of the piston 59, the regulating valve 99 is turned to produce a condition depicted in Fig. 23 wherein the pressure fluid. supply passsages 7 6 and 85 for the cylinder 56 are closed by the regulating valve. rThis cuts out of operation entirely the piston 58, the piston 59, however, voperating as a single hammer tool, the actuation of the controlling valve 71 being then edected in the usual manner and as above described.

The regulating valve 99 may be of any suitable construction and located in any selected position in the tool, but herein it is constructed as shown in Figs. 17 to 20 inclusive and arranged transversely the tool below the valve 71, as shown in Fig. 12. The valve is provided with two piston or barrel portions 108 and 109 connected by an intermediate liat portion 110. The latter lies adjacent the passages 76 and 77 in the valve block, as best shown in Figs. 11 to 13, so that it may be employed to maintain both passages open (Fig. 11), or close snc or the other oi the passages (Fig. 18).

The barrel portion 108 is provided with apertures 111, 112, 113, which, with the valve in position, aline with the passages 7 5, 85

and9l respectively; The barrel portion 109 likewise-is provided with apertures 11d, 11:3 c

and 116 adapted to aline" with the passages rk731k, S6 andy Q/lrespectively. The shape oi' f .the apertures 111 and 11o is snown in Fig.

1S; the shape of the aperture 115 in Fig 19,

` and the shape of the apertures 112, 113y and iii Lin signo.

i rl`hey end of the barrel v109 oit' the valve is` provided with a projection 117 which is enibraced by the forked end of thevalve stein 118', the'latter passing through an aperture in the threaded cap (Fig. 1.2), and being .A `'provided with the external regulating lever 119 (Fig), La), The lever is provided with a thumb or finger piecel() carrying a spring n' pressedfpin 121 (iigrl) adapted to engage with anyone of three notches formed in the leid-crier face of the valve block (Fig. 2l)

whereby itniay be moved to acentral position, or again the stop to throw out oi o eration the aiston .58. or aO'ain theo) )oscribed ar` specific` torni of tool and valve, 'such' specific description kis for illustrative "purposes only, `and the constructional feasitely rdisposed stop 123 which serves` to throwfout of operation both the piston 5S and the piston Y59.

I have herein referred more particularly to those features and functions of the valve and tool which are of particular importance c yin connection .with a machine of the character herein sety forth. These, as well as other features ofY the valve and tool are claimed broadlyin a cri-pending application, being claimed herein only in combination with the `.features Voi tlie'macliine in connectionwith which they are utilized. y

yllt will be obvious that, while I have deytures thereof( may be widely varied without f departing `from the spirit of the invention.

In the employment of this apparatus the operator, having adjusted the arm and the main supporting carriage, bv grasping the handle `4S with one hand andthe handle 5d with the other can turn the tool with its several sets of cutters about a vertical axis 0f movementon the tool carriage, and, at

, the same time, can adjust the tool carriage in e,

about the supporting column as a center, soy ythat theV tool may be guided in any desired f resultant path of movement made up of the or out alongtlie arm "and swing the arm components of these three adjustments.

In 'reeadjusting the apparatus the main f ysupporting carriage may be raised or lowyto theshaft while the radial arm maybe ,n adjustedlongitudinally, also as described, by i .60

ered as described by applying handy crank manipulating thehand lever 4G, all without n they necessity of the operator leaving his-position at the outer end of the'arm, which position is ordinarily taken with the block of stone 56 between yhim and the standard.

Theeliciency oit an apparatus of this kind z adjustment.

increased by the rigidity with whiclithe tool kcan be sustained'on itsk koverhangingy laterally extending support, so that as the latter is swungover tlie'suriace of the stone the v tical height of the tool is not'altered. rlhisrigidity or firmness iskatlectedto a conf siderable extent by the vibratory eilkectpro-1 `duced by the ordinary tool dueto the reciprocatory movement of' thepiston hammer.y

In 'the present apparatus this vibratory el? feet is materially diminished by, the ,provision of the two cutting units operating in 'nonfsynchronous relation and'V especially is it diminished when operating` rin opposed step, so that the overhanging arm'issubjected to less' displacementthrough the action of the tool and the apparatus, therev fore, correspondingly more effective.

therein without departingfrom the spiritk of the invention.

I clai1n` 1. In an apparatus of the classdescribed, the combination with acentralk support, a radial toolesupporting member adapted'to swing about said central support, said niember being longitudinally adjustable rela tively to said support, holding rmeans for holding saidmeniber longitudinally fixed,

and controlling means for rendering the same edective or ineiectiveat will, said controlling ymeans being controllable at a pointy relatively remote yfrom .saidy central support, said holding means acting to hold said mem-y ber in any given position of klongitudinal 2. yIn an apparatus of the class described,

*the combination with a central support, a

tool-supporting member longitudinellyk adjustable upon said central support for varying its effective lengtlnmeans to hold said member fixed in any given positionyoi longitudinal adjustment, and controlling means for renoering said holding means etlective or ineffective and located at or adjacent the tool-carrying end of said tool-supporting member. 5

3. Inan apparatusV of the class described,

iio

the combination with acentral support, of a tool-carrying-supporting n arm lon itudinally adjustable thereon, locking meansfor locking the same in any given posit-ion of longitudinal adjustment, a controlling member adjacent one end of said arm for rendering` y said locking means effective or inedectiveat y will, and connectionsbetween said controle ling members-nd 'said locking means. n

4L. A stone surfacing rmachine having a base, an upright standard, a sleeve mounted to turn and slide on said standard, a toolcarrying arm supported by said sleeve, a pressure-fluid-operated, percussive, cutting tool carried by said arm, means permitting the longitudinal adjustment of said arm to vary the eiiective radial distance ot the tool therefrom, a. clamp to hold said arm lixed with relation to said sleeve, and a connection controlling said clamp and extending lengthwise said arm toward said tool.

5. A stone surfacing machine having the upright standard 4, the tool-carrying arm 6, the carriage 9 mounted to turn and slide on the standard and provided with rollers l5, means tor longitudinally adjusting the arm relatively to the carriage, a clamp for clamping the arm to the carriage, and the-connection l0 extending toward the end oi the arm.

6. ln a stone surfacing machine, the combination With a pressure-fluid-operated, percussive cutting tool, of a central support, a sleeve mounted to turn and slide on said support, a tool-carrying supporting member carried by said sleeve and overhanging said central support, means permitting longitudinal adjustment of the same relatively to said central support for varying the effective length ot said tool-carrying member, means for holding said tool carrying member longitudinally fixed, and a tool-supporting carriage ireely adjustable along the tool-carrying member under the manual grasp et the operator.

7. In a stone surfacing machine, the combination with a pressure-fluidoperated, 3ercussive, cutting tool, of a central support, a sleeve mounted to turn and slide on said support, an overhanging tool-carrying arm lon* gitudinally adjustable on said central support, means for holding said tool carrying arm longitudinally iixed, means for holding said arm in iixed vertical position, a tool holder, grasping means upon said tool holder, and means permitting the free longitudinal adjustment oit said. tool holder along said arm under the manual grasp of the operator.

8. In an apparatus of the class described, the combination With an upright standard, a tool-carrying-supporting arm composed of parallel members suitably spaced and arranged on either side of said standard, means permitting the longitudinal adjustment of said arm relatively to said standard, means l'or holdingl the same in any given position oit longitudinal adjustment, and means for rendering the holding means effective or ineffective at will.

9. In an apparatus of the class described, the combination with a pressure-luidoperated, percussive, cutting tool, of upright supporting means, alaterally extending tool-supporting member carried by the same, flexible connections 'for vertically adjusting said supporting member on said supporting means, and means controllable at a point remote from said supporting means for controlling said flexible connections and thereby the vertical adjustment of said laterally extending member. t l0. ina stone surfacing machine, the combination with a pressure-fluid-operated, percussive, cutting tool, of upright supporting means, a laterally extending' tool-supporting arm carried thereby, flexible connections lor raising or lowering said arm vertically to adjust the same, and means accessible at the tool-carrying end of said arm 'for controlling said tlexible connections.

1l. ln an apparatus ot the class described,

the combination with central supporting means, a laterally extending tool-supporting arm, a flexible connection by which the same is suspended 'from said supporting means, and means controllable at or adjacent the outer end ci said arm for Winding in or un- Winding said flexible connection to adjust said arm vertically.

l2. ln an apparatus ot the class described, the combination With central supporting means, a longitudinally adjustable tool-carrying arm supported thereby, flexible connections between said arm and the said supporting means, and means controllable at or near the tool-carrying end of said arm and operatively related to said flexible connections for vertically adjusting said arm relatively to said supporting means.

13. In an apparatus of the class de-" scribed, tlie combination 1with central supporting means, ci a longitudinally adjustable toolcarrying arm supported thereby, a supporting flexible connection Ytor raising or lowering said arm, and a device for taking in or letting out said flexible connection positioned upon said arm.

let. ln an apparatus of the class described, the combination with central supporting means, of a longitudinally adjustable arm carried thereby, means 'for supporting said arm comprising a flexible connection suitably guided by sheaves, the latter supported near the upper portion of said supporting means, said flexible connection having one end attached to a part upon said supporting arm, and a Winding drum engaging the opposite end of said flexible connection and secured adjacent the opposite end of said arm, whereby the arm may be adjusted longitudinally Without atiecting the vertical adjustment and vice versa.

l5. ln a stone surfacing machine, the combination With a pressure-fluid-opera-ted, percussive cutting tool of an upright supporting standard, a main carriage vertically adjustable upon the same and adapted also to turn about said standard, a laterally extending arm supported by said carriage but adapted to be adjusted longitudinally upon ythe same, said carriage and said arm being freelymovable aboutthe standard by the l operator Whenpositioned aty the end of the arm, means f relatively remote from the .standard for vertically adjusting the said armjand carriage, and means `operable from a'point relatively remote from the standard n for holding said arm longitudinally lixed. 16. In any apparatus of the class described,

the combination Witha. central support, a!y laterally extending, longitudinally adjust# able, tool-carrying arm' sustained thereby tork and relatively remote from the central y Vmeans for supplying pressure fluid centrallyk 30,150 said/tool and substantiallyL coincident supportfor controlling the vertical adjust-` ment of Ysaid arm, and similar means simiy larly located for controlling the longitudinal adjustmentthereof.

17. In anapparatus of the class described,

the ycombination with a Support, a radial tool-carrying member Sustained thereby, a

pressure-lluid-actuated tool carried by said rmember, means permitting the 'turning of said" tool relatively to said member and With the turning axis thereof. y 18. `ln an apparatus of the 'class described, the lconfibinationwith aV central support, a

be swungi about ysaid supportata central position upon said supporting member7 While7 at the same time, to ybe moved relatively to said supporting member to maintain the re sulting lines of cutk in desired alinement.

- 19.L In an apparatus of the class described,

the combinationwith a power-actuated tool having aV plu 1ality of separate cuttingunits held in rlined relativek position, a support, a Y

laterally extending tool-supporting member secured' to saidsupport, and means permittingtlie said tool to be'turned bodily about y its attachment to.k the laterally yextending member, `andnieans also for permitting the latter to be turned about the support. f

20. Ink an apparatus of the class described7k the combination Witha support, a support-y ing arin adapted to be swungin the are of a y circle, a tool having a plurality ofseparate cutting units7k said tool being carried by said: arm7k andmeans to turn said tool and said cutting units together upon the said arm.

` In testimony whereof l have `signed in twosubscribing witnesses.

' GEO.y H. GILMAN` lVitn'esses: f f Geo. E. VVoLoo'mr,

F. C. BRITTON. f

'y Copies of this patent maybe obtained yfor rfive'cents each, by addressing the ',Cominssoner of' Patents, Washington, D. GJ

name to this specication, yin the presence ofk 

